![]() ![]() Below is the number of defects which based on the sigma level of any process. Lesser the standard deviation of the process, more precise or consistent is the process. Whereas in a 6 Sigma process, the values are closer to the centre line showing less variation in the process. In a 3 sigma process the values are widely spread along the centre line, showing the higher variation of the process. If a given set of data has normal probability distribution, then the number of defects that will occur in the process over a period of time can be known depending upon the sigma level of the process. ![]() It is a measure which uses the characteristic of past data to make judgements about how the process will perform in the future. ![]() Sigma or standard deviation is a statistical measure of dispersion in data. It focuses on the bottom-line and is a proven methodology for problem solving. It can also be used to bring breakthrough improvements in the process. In other words, it is a methodology to achieve 3.4 defects per million opportunities. It requires thorough understanding of product and process knowledge and is completely driven by customer expectations. Six Sigma is a data-based methodology to improve performance by reducing variability. It was initiated by Bill Smith at Motorola in 1986. Let us first understand what is six sigma, 6σ is Way of systematically improving processes by eliminating defects or in other words we can say that “Six Sigma” refers to the notion that if you have six standard deviations between the mean and the nearest specification limit, practically nothing will exceed the limits. ![]()
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